GM bulletin PIT5673A
What it saysThis Preliminary information communicates information for Intellibeam headlamp inoperative and to inspect the low speed data line. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Dec 21, 2023, received Jan 29, 2024, about the exterior lighting. It names 31 model years across Chevrolet, GMC, Buick and Cadillac (2017–2023). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Buick · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis Preliminary information communicates information for Intellibeam headlamp inoperative and to inspect the low speed data line.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT5673A | Service bulletin | Dec 21, 2023 | 10249300 | not found |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
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Model years it names
Source: as the manufacturer filed themChevrolet 11 model years
GMC 7 model years
Buick 6 model years
Cadillac 7 model years
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 31 model years this bulletin names have filed 4,356 complaints with NHTSA since 2015. 15 of them name Exterior Lighting — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2017 GMC Acadia, the 17 owners who gave an odometer reading for Exterior Lighting reported it at a median of 3,400 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Driving home tonight there was a car in front of me so my low beams were on. I saw a deer approaching from the right side of the roadway while at the same time dropping down into a small dip in the road and because the headlights are so low I lost sight of the deer as it was then in the shadows with no illumination because the headlights…
2022 Chevrolet Traverse · Exterior Lighting · filed with NHTSA Dec 28, 2022
The contact owns a 2022 Buick Enclave. The contact stated that while driving at various speeds, the daytime running lights failed to function as intended. No warning light was illuminated. Additionally, the contact stated that occasionally, while shifted into reverse, the rearview camera failed to display an image as intended.
2022 Buick Enclave · Exterior Lighting · filed with NHTSA Aug 29, 2025
The contact owns a 2023 Chevrolet Blazer. The contact stated that there was a dark shadow and circle on the headlight while driving at various speeds. There were no warning lights illuminated. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted.
2023 Chevrolet Blazer · Exterior Lighting · filed with NHTSA Jul 2, 2024
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the exterior lighting
Source: same model, same component group17 other manufacturer communications filed against these GM models under the same component group (exterior lighting), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 661.50 | Over-the-air update | Jun 17, 2026 | • Surround Vision Recorder, a new feature that allows you to record, watch, and save video from your vehicle's cameras. • Security Recording… |
| 25-NA-028 | Service bulletin | Apr 1, 2025 | This technical bulletin provides repair information to correct a customer concern of Blazer EV Turn Signal Fast Flash. |
| 25-NA-073 | Service bulletin | Mar 28, 2025 | This technical bulletin provides Approach Lighting Exterior and Interior Operation information and procedures. |
| 23-NA-086 | Service bulletin | Feb 12, 2025 | This informational bulletin provides information on dark spots in the headlamp pattern when the vehicle is pulled up to a wall or garage. |
| 01-08-42-001Q | Service bulletin | Jan 27, 2025 | This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines. |
| PIT6308 | Service bulletin | Dec 17, 2024 | This Preliminary information communicates information about if the rear tail lamp is inoperative to cycle the fuse. If the tail lamp is work… |
| PIE0801D | Service bulletin | Dec 5, 2024 | This engineering information (EI) closure ends the need for gathering further information from technicians in regard to the right and/or lef… |
| PIT6238C | Service bulletin | Nov 22, 2024 | This Preliminary information communicates information about if the rear tail lamp is inoperative to cycle the connector at the tail lamp. If… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, GMC, Buick and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM PIT5673A a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the PIT5673A repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does PIT5673A cover?
The manufacturer filed it against 31 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2023 Buick Enclave, 2022 Buick Enclave, 2021 Buick Enclave, 2020 Buick Enclave, 2019 Buick Enclave, 2018 Buick Enclave and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.